Fuel supply apparatus for internal combustion engines



L. KING.

APPLICATION FILED JUNE 5. 1918.

1,321,756. Patented Nov. 11, 1919.

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CHARLES F. L. KING, OF EDGBASTON, BIRMINGHAM, ENGLAND.

FUEL SUPPLY APPARATUS FOR INTERNAL-COMBUSTION ENGINES.

Specification of Letters Patent.

Patented Nov. 11, 1919.

Application filed June 5, 1918. Serial No. 238,371.

To all whom it concern:

Be it known that I, CHARLES FREDERICK Lawmsxrus Have, a subject of the King of Great Britain, residing at 138 Bristol road, Edgbast-on, Birmingham, England, have invented certain new and useful Improvements in l i'iel-Supply irpparatus for Internal-(jonitbustion Engines, of l ieh the following is a specification. p

This in ention relates to fuel supplyapparatifis for internal combustion engines of motor vehicles and the likefsaid apparatus bcingoi' that type in which a low level supily tuik is employed from which liquid fuel is rai..,-d by suction into an auxiliary reeeptacle llrom which it flows by gravity to the carbmeter; the suction and air valves being controlled by a rising and falling float.

Thai object of the present invention is to provide an improved and simplified form l valve mechanism. i 1

According to the said invention the suction and air valves are of thepiston valve type, and are carried upon asingle rod or stem operated from the float,'preferabl y through a. suitable lever, means being provided for allowing an idle movement to the float until it reaches its extreme raised and lowered positions so as to insure the suction valve remaining open and the air valve closed while the float is rising and the said suction valve remaining closed-and the air valve open while the fuel is' being discharged.

Figural of the accompanying drawings represents a vertical section through an apparatus in accordance with this invention.

Fig. represents a modification.

The apparatus shown in Fig. 1 comprises a float 1 mounted to slide upon a guide rod 2 between stop pins 3, 4; or the float may be fixed upon the rod. The upper end of the latter is pivoted-to the longer arm 5 of a bell-crank lever fulcrumed at 6 to a bracket 7 within the upper part of the receptacle 8. The other or short arm 9 of this lever is arranged substantially vertically and en ages within a slot or recess 10 formed in a cylindrical part or actuating head 11 attache-l to a horizontally sliding valve rod 12 located in a housing in the cover 13 of the receptacle. This rod 12 carries the suction and air valves 14, 15, which are in the form of cylindrical piston valves. The suction valve 14 moves in a chamber 16 having a port 17 leading to the suction pipe and beport 20and through the valve rod tween the suction valve chamber 16 and the chamber 18 containing the actuating head, is a passage 19 of rather larger bore than the diameter of the valve rod 12 and from which a port 2-0 leads into the receptacle 8. When the suction valve 11 is in a position such that the port 17 leading to the suction pipe is uncovered, as in Fig. 1,.the air can be Withdrawn from the. receptacle 8 through the passage valve chamber 16 and thence through the suetion pipe. On the closing of the valve it first covers the port 17 leading' to the suction pipe and then closes on to its seating 21 at the end of the 'alve chamber. A

The air valve 15 works in passage 22 open to the atmosphere at one end and communicating at the other end, when the valve is withdrawn, with an enlarged chamber 23, which is in communication with the interior of the receptacle by a passage 24. When the valve 15 is within the cylindrical passage 22 the air is cut oil, but as soon as its outer end leaves said passage and enters the enlarged chamber 23 (which happens when the suction valve 14 closes on to its seating) the air suddenly rushes into the receptacle.

The end of the actuating head 11 of the valve rod is always subjected to atmospheric pressure by means of an opening or openings 25 in the chamber 18 in which it moves.

The operation of the apparatus is as follows :-Assuming the suction valve 14 to be open, as shown in Fig. 1, and the air valve 15 closed air is withdrawn from the receptacle, which thus fills with suitable inlet. As the fioat 1 rises it engages with stop 3 causing the short arm 9 of the bell-crank lever to move idly within the slot or recess 10 in the actuating head 11 of the valve rod until the said float has nearly reached its highest position, when said arm9 engages with the end of the slot or recess and moves the valve rod 12, causing 19 into the suction a cylindrical the suction valve 1.4 first to close theport 17 leading to the suction pipe, and then to move fully onto its seating 21. At the same time the air valve 15 is witl'idrawn from its cylindrical passage into the enlarged chamber 23, thus admitting air to the receptacle. The fuel is then discharged from the outlet 26 past the flap valve. 27 into the outer chamber 28, whence it passes to the carbureter. Th float falls, but owing to the idle move fuel through a ment allowed by the slot or recess 10 in the actuating head of the valve rod, and by the stops 3, a, on the guide rod, the valves remain in the position described until the fuel has descended to a predetermined .level, when the short arm 9 of the bell-crank lever engages with the opposite end of the slot or recess 10 and moves the valve rod 12 in the opposite direction, closing the air valve and opening the suction valve, the receptacle thus re-filling.

If the float be. fixed upon the rod 2 the idle or lost-movement may be provided for entirely by the slot 10. It may, however, be obtained as shown in Fig. 2,- where the rod 2 having the float fixed to it,carries' apin 29 slidingtin a slot 30 in a sleeve 31 1. A fuel-supply apparatus comprising a low-level reservoir, an auxiliary receptacle communicating with the low-level reservoir,

a source of suction, a cover to the receptacle provided with a valve housing having ports communicating with the source of suction and the atmosphere and air and suction portsleading to the receptacle, piston-type air and SLlCtlOIlWtLlYt-ES carried? by a horizontally sliding stem within the housing for controlling said ports, a float, a lever operated by the float and engaging with the valve stem, and a lost-motion connection between the float and the valve stem.

2. A fuel-supply apparatus comprising a low-level reservoir, an auxiliary receptacle ling said ports, a float, a head on the valve stem provided with a recess, a lever operated by the float and having one arm engaging the recess in the head of the valve stem, and

,a lost-motion connection between the float and the valve stem.

3.- A fuel supply apparatus comprising a low-level reservoir, an auxiliary receptacle communicating with the low-level reservoir, a source of suction, a piston-type suction valve sliding in a chamber communicating with the source of suction and with the receptacle, an air valve sliding within an open chamber leading to an enlargement communicating with the receptacle and adapted to move into said enlargement, when the suction valve is closed, so as to place said receptacle in communication with the atmosphere, a stem carrying both air and suction valves, :1 float, and a lost-motion connection between the float and the valve stem.

In testimony whereof Ihave hereunto set my hand in presence of two subscribing witnesses.

G. F. L. KING. Witnesses:

H. O, Pim'rr, H. N. SKERRETT. 

